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Summary: Ctors | Methods | Protected Methods | Inherited Methods

# ContentQueryMap

`public class ContentQueryMap`
`` `extends Observable` ``

java.lang.Object
↳ | java.util.Observable
| ↳ | android.content.ContentQueryMap

Caches the contents of a cursor into a Map of String->ContentValues and optionally keeps the cache fresh by registering for updates on the content backing the cursor. The column of the database that is to be used as the key of the map is user-configurable, and the ContentValues contains all columns other than the one that is designated the key.

The cursor data is accessed by row key and column name via getValue().

## Summary

### Public constructors
`ContentQueryMap(Cursor cursor, String columnNameOfKey, boolean keepUpdated, Handler handlerForUpdateNotifications)` Creates a ContentQueryMap that caches the content backing the cursor

### Public methods
`void` | `close()`
`Map<String, ContentValues>` | `getRows()`
`ContentValues` | `getValues(String rowName)` Access the ContentValues for the row specified by rowName
`void` | `requery()` Requeries the cursor and reads the contents into the cache
`void` | `setKeepUpdated(boolean keepUpdated)` Change whether or not the ContentQueryMap will register with the cursor's ContentProvider for change notifications.

### Protected methods
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

### Inherited methods
From class `java.util.Observable`
`void` | `addObserver(Observer o)` Adds an observer to the set of observers for this object, provided that it is not the same as some observer already in the set.
`void` | `clearChanged()` Indicates that this object has no longer changed, or that it has already notified all of its observers of its most recent change, so that the `hasChanged` method will now return `false`.
`int` | `countObservers()` Returns the number of observers of this `Observable` object.
`void` | `deleteObserver(Observer o)` Deletes an observer from the set of observers of this object.
`void` | `deleteObservers()` Clears the observer list so that this object no longer has any observers.
`boolean` | `hasChanged()` Tests if this object has changed.
`void` | `notifyObservers(Object arg)` If this object has changed, as indicated by the `hasChanged` method, then notify all of its observers and then call the `clearChanged` method to indicate that this object has no longer changed.
`void` | `notifyObservers()` If this object has changed, as indicated by the `hasChanged` method, then notify all of its observers and then call the `clearChanged` method to indicate that this object has no longer changed.
`void` | `setChanged()` Marks this `Observable` object as having been changed; the `hasChanged` method will now return `true`.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

## Public constructors

### ContentQueryMap

    public ContentQueryMap (Cursor cursor,
                    String columnNameOfKey,
                    boolean keepUpdated,
                    Handler handlerForUpdateNotifications)

Creates a ContentQueryMap that caches the content backing the cursor

Parameters
`cursor` | `Cursor`: the cursor whose contents should be cached
`columnNameOfKey` | `String`: the column that is to be used as the key of the values map
`keepUpdated` | `boolean`: true if the cursor's ContentProvider should be monitored for changes and the map updated when changes do occur
`handlerForUpdateNotifications` | `Handler`: the Handler that should be used to receive notifications of changes (if requested). Normally you pass null here, but if you know that the thread that is creating this isn't a thread that can receive messages then you can create your own handler and use that here.

## Public methods

### close

    public void close ()

### getRows

    public Map<String, ContentValues> getRows ()

Returns
`Map<String, ContentValues>` |

### getValues

    public ContentValues getValues (String rowName)

Access the ContentValues for the row specified by rowName

Parameters
`rowName` | `String`: which row to read

Returns
`ContentValues` | the ContentValues for the row, or null if the row wasn't present in the cursor

### requery

    public void requery ()

Requeries the cursor and reads the contents into the cache

### setKeepUpdated

    public void setKeepUpdated (boolean keepUpdated)

Change whether or not the ContentQueryMap will register with the cursor's ContentProvider for change notifications. If you use a ContentQueryMap in an activity you should call this with false in onPause(), which means you need to call it with true in onResume() if want it to be kept updated.

Parameters
`keepUpdated` | `boolean`: if true the ContentQueryMap should be registered with the cursor's ContentProvider, false otherwise

## Protected methods

### finalize

    protected void finalize ()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the `finalize` method to dispose of system resources or to perform other cleanup.

The general contract of `finalize` is that it is invoked if and when the Java™ virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The `finalize` method may take any action, including making this object available again to other threads; the usual purpose of `finalize`, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The `finalize` method of class `Object` performs no special action; it simply returns normally. Subclasses of `Object` may override this definition.

The Java programming language does not guarantee which thread will invoke the `finalize` method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the `finalize` method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The `finalize` method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the `finalize` method causes the finalization of this object to be halted, but is otherwise ignored.

Throws
`Throwable` |

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